i think the si has a different part number for the rear bumper because of the hfp muffler....if you have the si rear lip the muffler would be no problem. and i think you could cut out the r18 hfp rear lip the same way if you wanted to.
the sedan r18 and si rear lip are a bit different and will need to do a dew minor adjustments to make it fit the r18. with the hfp exhaust it should sitll be able to fit, but for installation it may be easier to take off the axle and then put it back on after. There are some R18s who have Greddy with the r18 rear lip. but probably did adjustments to the hanger.
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